Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26045
Title: Detection of iron-oxide magnetic nanoparticles using magnetic tunnel junction sensors with conetic alloy
Authors: Lei, ZQ
Leung, CW 
Li, L
Li, GJ
Feng, G
Castillo, A
Chen, PJ
Lai, PT
Pong, PWT
Keywords: Iron-oxide magnetic nanoparticles
magnetic sensors
magnetic tunnel junction (MTJ)
Issue Date: 2011
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on magnetics, 2011, v. 47, no. 10, 6027820, p. 2577-2580 How to cite?
Journal: IEEE transactions on magnetics 
Abstract: We demonstrated the detection of 20-nm iron-oxide magnetic nanoparticles (MNPs) using Al 2 O 3 magnetic tunnel junction sensors (MTJs) with Conetic alloy. Conetic alloy Ni 77Fe 14Cu 5Mo 4 was deposited as the MTJ free layer and pinned layer due to its magnetically soft properties. The magnetoresistance (MR) curves of MTJs with Conetic alloy showed tunneling magnetoresistance of 8.0% with small hysteresis and high linearity in the sensing region, after applying an external magnetic field of 14 Oe along the hard axis. The sensitivity of the MTJ sensors with Conetic alloy was determined to be 0.3%/Oe within a linear region at room temperature. The MNPs of three different concentrations were successfully detected by the shifts of the MR loops of the MTJs, and it was observed that the resistance deviations of the MTJ sensors increased with the logarithm of MNP concentrations. The maximum resistance deviation was 0.16 Ω for an MNP concentration of 20.0 mg/mL. MTJ sensors, together with MNPs, are a promising platform for future biosensor applications, and this paper shows that Conetic alloy is feasible for improving the performance of this platform.
URI: http://hdl.handle.net/10397/26045
ISSN: 0018-9464
EISSN: 1941-0069
DOI: 10.1109/TMAG.2011.2157099
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